My grandmother always told me to wear clean underpants everyday in case I got hit by a car—and to keep my camera lens clean in case I needed to take a good photo. Granted, I made that last part up, ...

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No matter how careful and clean you are with your gear, inevitably you'll get some dust, fingerprints, or other gunk on your lenses. If you're in the field or on a shoot, you might be tempted to just ...